Abstract
An analytical model of the dynamic characteristics of a quantum-well
(QW) semiconductor optical amplifier (SOA) is developed. Closed-form expressions
for the optical gain and cross-gain modulation (XGM) for arbitrary input pulses
are derived. The model takes into account the carrier capture and escape transitions
between the QW and the continuum states. This model is also used to derive
a closed-from expression for interchannel XGM crosstalk in multichannel SOA
systems. The model/analysis provides insight into the effect of the SOA parameters
on the performance of a wavelength-division multiplexed system. We found that
crosstalk in a multichannel SOA system can be reduced by reducing the escape
lifetime.
© 2008 IEEE
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